Make String.charCodes a getter.

utils/pub/utils.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Generic utility functions. Stuff that should possibly be in core.
  */
 library utils;
 
 import 'dart:crypto';
@@ skipping 101 matching lines @@
   for (var match in matcher.allMatches(str)) {
     if (match.end() == str.length) return true;
   }
   return false;
 }
 
 /**
  * Returns the hex-encoded sha1 hash of [source].
  */
 String sha1(String source) =>
-  CryptoUtils.bytesToHex(new SHA1().update(source.charCodes()).digest());
+  CryptoUtils.bytesToHex(new SHA1().update(source.charCodes).digest());
 
 /**
  * Returns a [Future] that completes in [milliSeconds].
  */
 Future sleep(int milliSeconds) {
   var completer = new Completer();
   new Timer(milliSeconds, completer.complete);
   return completer.future;
 }